Microphone and preamplifier for infrasound measurements
21 November 2015
PCB Piezotronics has introduced a 12mm microphone and preamplifier system for use in low frequency testing that is suitable for studies ranging from wind turbines to natural events like tornadoes.
Low frequency measurements are commonly required for wind turbines, sonic booms, diesel engines and specialised loudspeaker systems to name a few. Natural events such as tornadoes and earthquakes emit very low frequency pressure waves which can travel long distances without being blocked. The new 378A07 model microphones can detect these low frequency signatures as potential danger.
The free-field pre-polarised microphone has a frequency range of 0.13Hz to 20kHz (±2dB) which meets the IEC 61094-4 standard for test and measurement microphones. This covers infrasound which is below the normal hearing range for adults.
PCB carries a full complement of pre-polarised and externally polarised condenser microphones and preamplifiers. Pre-polarised microphones use standard coaxial cables and are ICP compliant, allowing power supplies to be shared with other ICP compliant products, such as accelerometers.
This interchangeability can result in significant per-channel cost savings as well as reducing test set-up time. The 378A07 microphone is supplied with an A2LA and ILAC accredited initial calibration.
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